Vagrantfile. It is only used for your internal identification.
The EC2 server will not be accessible without your private/public key.
This corresponds to the "EC2 Key Pair Name".
It will not be accessible using username/password, only private key!
The AMI must be available to the region and size selected above.
You are responsible for ensuring the AMI you select is compatible with PuPHPet configs. Currently Ubuntu 14.04, 16.04 and CentOS 6.x, 7.x are supported.